Hammer head



FIG. 1 is a perspective view of my design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a right side view thereof, the left side view being a mirror image thereof.

The dashed lines in FIGS. 1-6 represent a generic handle that forms no part of the claimed design. 

CLAIM The ornamental design for a hammer head, as shown and described. 